sediment oxygen demand. the rate that dissolved oxygen from the water column is consumed by chemical and biological processes at or near the riverbed, such as respiration by benthic organisms, degradation of organic matter and chemical oxidation
super oxide dismutase an enzyme which plays a key part in converting harmful free radicals into inert non-damaging molecules, superoxide dismutase is a potent anti-oxidant.
Superoxide Dismutase. An antioxidant enzyme which helps protect cells from free-radical damage.